In the 99 diagram, there is a 30 amp fuse that feeds the contacts of the PCM relay. After it leaves the relay, it feeds several other fuses in the fuse box under the hood.

One of them is fuse #23, 15 amp and it feeds a red/yellow wire.

Another is fuse #18, 15 amp that feeds a red wire.

The last is fuse #24, 15 amp that feeds a violet/white wire.

If your truck is like this, and none of these fuses are blowing, then the problem must be on the yellow black that feeds the PCM power relay or the violet wire that leaves the PCM power relay.